Thermal, Catalytic Conversion of Alkanes to Linear Aldehydes and Linear Amines
作者:Xinxin Tang、Xiangqing Jia、Zheng Huang
DOI:10.1021/jacs.8b01526
日期:2018.3.21
constituents of petroleum, are attractive feedstocks for producing value-added chemicals. Linear aldehydes and amines are two of the most important building blocks in the chemical industry. To date, there have been no effective methods for directly converting n-alkanes to linear aldehydes and linear amines. Here, we report a molecular dual-catalyst system for production of linear aldehydes via regioselective
La technique électroehimique à l'anode consommable, en compartiment unique et à intensité constante est une excellente méthode préparative pour la création de liaisons Si-Si et Si-C qui évite l'emploi des métaux alcalins. Comme elle est par ailleurs extrêmement sélective, elle peut conduire à des composés originaux inaccessibles directement par voie chimique. Des bases, telles que le sel de magnésium de la 2-pyrrolidone. électroengendrées dans les mêmes conditions ont été utilisées pour la synthèse compétitive stéréosélective d'énoxysilanes Z. Enfin, sont rapportes les potentiels de réduction d'une large série de chlorosilanes, mesurés par voltampéro- métrie cyclique, dans des conditions standards.
Reduction of Allylpalladium(II)chloride Dimer by Formation of Allyloxysilanes
作者:Scott Denmark、Russell Smith
DOI:10.1055/s-2006-951516
日期:2006.11
The reduction ofallylpalladium(II)chloride dimer (APC) to a Pd(0) species can be effected by reaction with alkali metal silanolates. The reduction is extremely rapid in the presence of chelating bisphosphine ligands and for a variety of silanolates.
烯丙基氯化钯 (II) 二聚体 (APC) 还原为 Pd(0) 物质可以通过与碱金属硅烷醇盐反应来实现。在螯合双膦配体和各种硅烷醇化物存在的情况下,还原速度非常快。
Unbridged 1- and 2-substituted bis(silylindenyl) zirconium(IV) and hafnium(IV) dichloride complexes as catalyst precursors for ethylene polymerization
作者:Mohamed E.M. Abdelbagi、Helmut G. Alt
DOI:10.1016/j.poly.2017.07.028
日期:2017.11
same substituent in 2-position of the indenyl moiety. For instance, the MAO activated complex bis(η5-1-(dimethyl-4-tolylsilyl)idenyl) zirconium(IV) dichloride (3), displayed an almost five times higher activity (3980 kg PE/mol cat.h) than the isomeric bis(η5-2-(dimethyl-4-tolylsilyl)indenyl) zirconium(IV) dichloride (19)/MAO catalyst (870 kg PE/mol cat.h). The same trend was observed for the para-fluorophenyl
摘要[1-(4-XC6H4SiMe2)-η5-Ind] 2MCl2和[2-(4-XC6H4SiMe2)-η5-Ind] 2MCl2(X = Me,MeO,F; M = Zr ,具有不同的1-和2-取代的茚基配体的Hf)已经合成,表征并用于催化乙烯聚合。用甲基铝氧烷(MAO)活化后,所有配合物都是乙烯聚合的催化剂。但是,在几乎所有情况下,在茚基部分的2-位上具有甲硅烷基取代基的物种都比在相同的位置上具有相同取代基的物种具有更高的活性。例如,MAO活化的二氯化双(η5-1-(二甲基-4-甲苯基甲硅烷基)烯基)锆(IV)(3)的活性几乎提高了五倍(3980 kg PE / mol猫。h)比同分异构的双(η5-2-(二甲基-4-甲苯基甲硅烷基)茚基)二氯化锆(IV)(19)/ MAO催化剂(870 kg PE / mol cat.h)。对于对氟苯基甲硅烷基茚基络合物23和17,观察到相同的趋势。可
Regioselective Synthesis of Multisubstituted Benzenes by Palladium-Catalyzed Intermolecular Reaction of β-Iodo-β-silylstyrenes with Alkynes
The Pd-catalyzed reaction between beta-iodo-beta-silyistyrenes and terminal alkynes in i-Pr2NEt gave 1,2,3,5-tetrasubstituted benzenes with complete regioselection. The use of certain silylacetylenes as alkynes enabled efficient synthesis of 1,3,5-trissilyl-2-arylbenzenes, which could be transformed into other multisubstituted benzenes by displacement of the silyl groups.